Air-compressor.



A. NEUMANN.

AIR COMPRESSOR.

APPLICATION FILED APR.28,1908.

' Patented Oct. 12, 1909.

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F El: EE km g H I M ulltiilt fill 1r m I ,7 W i M m 11, I t l! m m \N \N mm N\ MNHI A. NEUMANN. AIR COMPRESSOR.

APPLICATION FILED APR.28,1908.

Patented Oct. 12, 1909.

3 SHEETS-SHEET 2.

0 Q. a 2 a A.- NEUMANN. AIR COMPRESSOR.

APPLICATION FILED APE. 28, 1908.

Patented Oct. 12, 1909.

3 SHEETS-SHEET 3.

' ARTHUR NEUMANN, 013' UNITED stra ns PATENT FF CE.

ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF '10 DANIEL F.

IBEHRENS, OF CLAYTON, MISSOURI.

AIR-QOMPRESSOR.

Specification of Letters laitent.

Patented Oct. 12, 1909.

Application filed April 28, 1908. Serial No. 429,781.

To all whom it may concern:

Be 1t known that I, ARTHUR NEUM'A'NN, a

I citizen of the United States. and resident of St. Louis, Missouri, have invented certain new and useful Improvementsin Air-Compressors, of which the following is a specitication invention relates to ll'nprovements in aucomp'ressors andlhas for its object to provide. a simple and eflicient aucompres- A sor, capableof being used in series with the result of multiplying its cfliciency when desired.

In the drawings-Figure 1 is a front elevation of a compressor embodying my in- I vention, showing the fly-wheel, drive-wheel,

a portion of the tubular shaft, and a portion of 'the cylinder in section. Fig. 2 is a vertical sectional view of the same. Fig. 3 is an enlarged perspectlve view of a section of "the revolving piston. Fig-4 is an enlarged pers ')ective view of one end of the lower half of the cylinder-member. Fig. 5 is ahori zontal sectional view of one end of the compressor'. Fig.6 is a diagrammatic view illustrating the construction and operation .of

the compressor of my invention when arranged in a series of three for the purpose ot mult plylng its compression.

As shown in the drawlngs, ournal boxes 7-8 are carriedby vertical uprights 910.

- which valve memb'ers are held by the slidthe piston 14. The piston 14 is constructed,

ling-rack 21, as illustrated in Fig. 2, and the inner edges of said valye-members 20 are at all times in contact wlth the outer face of as illustrated in the drawings, in the form of. a cylindrical shell having within it the longitudinal cylinder 22 within which the shaft 11 is mounted; the shaft 11 and the cylinder 22 being provided with radial perforations 23 24 registeringvwith each other. The outer face of'the piston14 is provided with longitudinal packing strips 25, and the side of the piston member 14 which is opposite to the direction of the rotating drive of the piston is provided with perforations 26. The shells 16 and 17 are provided longitudinally with packing strips'27 which 0011- tact with the upper and lower faces of the slide valve-member 20 to render the same airtight. The shell 16 is provided with the outlet opening 28 and valve 29 connecting with the airtight outlet tube 30; and the shell 17 is provided with a corresponding air-outlet opening 31 and outlet valve 32 connecting with the outlet pipe 33. The shell 16 is provided with a longitudinal duct or passage 34an dtheshell 17 is provided with a like duct or passage 35, these ducts or passages 34 and 35 having the water tube connections 36 and 37, respectively," form 'ing' a water-jacket, the ducts or passages 34 and 35 communicating with the water-jacket compartments 38 wit-h which each of the cylinder heads is provided.

The mode of operation of the compressor hereinbefore described is as follows: The direction of the drive'of the pistonis as indicated by the arrow in Fig. 2; the compressionxbein efiected by the forward movement of the'lmperforate half of the cylindrical piston, the slide valves 2020 operating in unison to prevent the rearward escape of the air compressed, and'th'e valves 29--32 operating successively to permit the escape of the compressed air through the outlet pipes 3033, respectively. The air supply is accomplished through the interior of the shaft. 11 and the perforations 23. 24. and 26.

Forthe purpose of multiplying the power of my compressor, the units hereiubefore describedare arranged in series upon the same shaft, and I i have illustrated a group of three diagrammatically in Fig. 6; but all of the units after the first are mounted upon an imperfo'rate section of the shaft and all of'the revolving pistons after the first are im erforate, as the first unit only is desired to e provided with an air inlet.

In the diagrammatical illustration enlbodied in Fi 6, the movement of the air from its origmal'admission to the first unit to its final expulsion from the third cylinder is illustrated by arrows.

Having fully described my invention, what 'I claim as new and desire to have secured to me by the grant of Letters Patent, is:

g 1'. In an air compressor, a. stationary cylinder; a revoluble hollow shaft mounted concentrically with said cylinder; a cylindrical piston of smaller diameter than said cylinder and fixedly mounted upon said shaft ecoentrically with reference to said cylinder, said piston and shaft being perforated to admit air to the cylinder through the interior of said shaft; and slide valves contacting with the outer face of said piston, substantially as described.

2. In an air compressor, a stationary cylin'der; a revoluble hollow shaft mounted concentrically with said cylinder; a cylindrical piston of smaller diameter than said c linder and fixedly mounted upon said sha eccentrically with reference to said cylinder, said piston and shaft being perforated to admit air to the cylinder through the interior of said shaft; and slide valves contacting with the outer face of said piston, said slidevalves being mounted in apertures in said cylinder and connected by a reciproeating rack, substantially as described.

In testimony whereof, I have signed my name to this specification, in presence of two subscribing witnesses.

ARTHUR N EUMAN N Witnesses:

ALFRED A. EIOKS, WALTER C. STEIN. 

